| // Copyright 2011 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // Parse Plan 9 timezone(2) files. |
| |
| package time |
| |
| import ( |
| "os" |
| "strconv" |
| "strings" |
| ) |
| |
| func parseZones(s string) (zt []zonetime) { |
| f := strings.Fields(s) |
| if len(f) < 4 { |
| return |
| } |
| |
| // standard timezone offset |
| o, err := strconv.Atoi(f[1]) |
| if err != nil { |
| return |
| } |
| std := &zone{name: f[0], utcoff: o, isdst: false} |
| |
| // alternate timezone offset |
| o, err = strconv.Atoi(f[3]) |
| if err != nil { |
| return |
| } |
| dst := &zone{name: f[2], utcoff: o, isdst: true} |
| |
| // transition time pairs |
| f = f[4:] |
| for i := 0; i < len(f); i++ { |
| z := std |
| if i%2 == 0 { |
| z = dst |
| } |
| t, err := strconv.Atoi(f[i]) |
| if err != nil { |
| return nil |
| } |
| t -= std.utcoff |
| zt = append(zt, zonetime{time: int32(t), zone: z}) |
| } |
| return |
| } |
| |
| func setupZone() { |
| t, err := os.Getenverror("timezone") |
| if err != nil { |
| // do nothing: use UTC |
| return |
| } |
| zones = parseZones(t) |
| } |
| |
| func setupTestingZone() { |
| f, err := os.Open("/adm/timezone/US_Pacific") |
| if err != nil { |
| return |
| } |
| defer f.Close() |
| l, _ := f.Seek(0, 2) |
| f.Seek(0, 0) |
| buf := make([]byte, l) |
| _, err = f.Read(buf) |
| if err != nil { |
| return |
| } |
| zones = parseZones(string(buf)) |
| } |
